Subversion Repositories openrisc

;/*

;    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.

;

;    ***************************************************************************

;    *                                                                         *

;    * If you are:                                                             *

;    *                                                                         *

;    *    + New to FreeRTOS,                                                   *

;    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *

;    *    + Looking for basic training,                                        *

;    *    + Wanting to improve your FreeRTOS skills and productivity           *

;    *                                                                         *

;    * then take a look at the FreeRTOS books - available as PDF or paperback  *

;    *                                                                         *

;    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *

;    *                  http://www.FreeRTOS.org/Documentation                  *

;    *                                                                         *

;    * A pdf reference manual is also available.  Both are usually delivered   *

;    * to your inbox within 20 minutes to two hours when purchased between 8am *

;    * and 8pm GMT (although please allow up to 24 hours in case of            *

;    * exceptional circumstances).  Thank you for your support!                *

;    *                                                                         *

;    ***************************************************************************

;

;    This file is part of the FreeRTOS distribution.

;

;    FreeRTOS is free software; you can redistribute it and/or modify it under

;    the terms of the GNU General Public License (version 2) as published by the

;    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.

;    ***NOTE*** The exception to the GPL is included to allow you to distribute

;    a combined work that includes FreeRTOS without being obliged to provide the

;    source code for proprietary components outside of the FreeRTOS kernel.

;    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT

;    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

;    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

;    more details. You should have received a copy of the GNU General Public

;    License and the FreeRTOS license exception along with FreeRTOS; if not it

;    can be viewed here: http://www.freertos.org/a00114.html and also obtained

;    by writing to Richard Barry, contact details for whom are available on the

;    FreeRTOS WEB site.

;

;    1 tab == 4 spaces!

;

;    http://www.FreeRTOS.org - Documentation, latest information, license and

;    contact details.

;

;    http://www.SafeRTOS.com - A version that is certified for use in safety

;    critical systems.

;

;    http://www.OpenRTOS.com - Commercial support, development, porting,

;    licensing and training services.

;*/

#include "ISR_Support.h"

;------------------------------------------------------------------------------

#if __CORE__ != __78K0R__

        #error "This file is only for 78K0R Devices"

#endif

#define CS                    0xFFFFC

#define ES                    0xFFFFD

; Functions implemented in this file

;------------------------------------------------------------------------------

        PUBLIC    vPortYield

        PUBLIC    vPortStart

; Functions used by scheduler

;------------------------------------------------------------------------------

        EXTERN    vTaskSwitchContext

        EXTERN    vTaskIncrementTick

; Tick ISR Prototype

;------------------------------------------------------------------------------

;       EXTERN    ?CL78K0R_V2_L00

        PUBWEAK   `??MD_INTTM05??INTVEC 68`

        PUBLIC    MD_INTTM05

MD_INTTM05    SYMBOL "MD_INTTM05"

`??MD_INTTM05??INTVEC 68` SYMBOL "??INTVEC 68", MD_INTTM05

;------------------------------------------------------------------------------

;   Yield to another task.  Implemented as a software interrupt.  The return

;   address and PSW will have been saved to the stack automatically before

;   this code runs.

;

;   Input:  NONE

;

;   Call:   CALL    vPortYield

;

;   Output: NONE

;

;------------------------------------------------------------------------------

    RSEG CODE:CODE

vPortYield:

        portSAVE_CONTEXT                        ; Save the context of the current task.

        call      vTaskSwitchContext    ; Call the scheduler to select the next task.

        portRESTORE_CONTEXT                     ; Restore the context of the next task to run.

        retb

;------------------------------------------------------------------------------

;   Restore the context of the first task that is going to run.

;

;   Input:  NONE

;

;   Call:   CALL    vPortStart

;

;   Output: NONE

;

;------------------------------------------------------------------------------

    RSEG CODE:CODE

vPortStart:

        portRESTORE_CONTEXT                 ; Restore the context of whichever task the ...

        reti                                            ; An interrupt stack frame is used so the task

                                    ; is started using a RETI instruction.

;------------------------------------------------------------------------------

;   Perform the necessary steps of the Tick Count Increment and Task Switch

;   depending on the chosen kernel configuration

;

;   Input:  NONE

;

;   Call:   ISR

;

;   Output: NONE

;

;------------------------------------------------------------------------------

MD_INTTM05:

        portSAVE_CONTEXT                        ; Save the context of the current task.

        call      vTaskIncrementTick    ; Call the timer tick function.

#if configUSE_PREEMPTION == 1

        call      vTaskSwitchContext    ; Call the scheduler to select the next task.

#endif

        portRESTORE_CONTEXT                     ; Restore the context of the next task to run.

        reti

;       REQUIRE ?CL78K0R_V2_L00

        COMMON INTVEC:CODE:ROOT(1)      ; Set ISR location to the Interrupt vector table.

        ORG 68

`??MD_INTTM05??INTVEC 68`:

        DW MD_INTTM05

        COMMON INTVEC:CODE:ROOT(1)      ; Set ISR location to the Interrupt vector table.

        ORG 126

`??vPortYield??INTVEC 126`:

        DW vPortYield

                                                                        ; Set value for the usCriticalNesting.

        RSEG NEAR_ID:CONST:SORT:NOROOT(1)

`?`:

        DW 10

;#endif

      END